<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			*{
				margin:0;
				padding:0;
			}
			
			.c1{
				width:100px;
				border:1px solid red;
			}
			.mAuto{
				margin:0 auto;
				border-bottom: none;
			}
		</style>
	</head>
	<body>
		<div class="mAuto c1">
			123123
		</div>
		
		<div id="d1" class="">
			2222
		</div>
	</body>
</html>
